Reafactor of xtrabackup scripts
Fix authorized_keys file

Related: PROD-26996(PROD-26996)

(cherry picked from commit 92b8ff4c93103a07d0855820aca03e6d383975e7)
(cherry picked from commit e72102718205baad49fdf569a582fc211fffc071)

Change-Id: I882785b84220cff39667f879ff9ba964dbe47808
5 files changed